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During one time period, the price of rhodium increased at a rate that was proportional to the price of rhodium at that time. The price for an ounce of rhodium was 475475 initially, and it quadrupled every 2525 months. What was the price for an ounce of rhodium after 1818 months?

Full solution

Q. During one time period, the price of rhodium increased at a rate that was proportional to the price of rhodium at that time. The price for an ounce of rhodium was 475475 initially, and it quadrupled every 2525 months. What was the price for an ounce of rhodium after 1818 months?
  1. Given Information: We are given that the price of rhodium quadruples every 2525 months. This means that the price is multiplied by 44 every 2525 months. To find the price after 1818 months, we need to determine the growth factor for 1818 months.
  2. Calculate Growth Rate: Since the price quadruples every 2525 months, we can express the growth rate per month as the 2525th root of 44. This is because if we take this growth rate and raise it to the power of 2525, we should get 44.\newlineGrowth rate per month = (4)(1/25)(4)^{(1/25)}
  3. Apply Growth Rate: Now we need to apply this monthly growth rate to the initial price of rhodium for 1818 months. This means we will raise the growth rate to the power of 1818 and multiply it by the initial price.\newlinePrice after 1818 months = 475×(4)(18/25)475 \times (4)^{(18/25)}
  4. Calculate Growth Factor: Let's calculate the growth factor for 1818 months: Growth factor for 1818 months = (4)(18/25)(4)^{(18/25)} We can use a calculator to find this value.
  5. Find Growth Factor Value: After calculating the growth factor for 1818 months, we find:\newlineGrowth factor for 1818 months 2.6561\approx 2.6561 (rounded to four decimal places)
  6. Calculate Price After 1818 Months: Now we multiply the initial price by the growth factor to find the price after 1818 months:\newlinePrice after 1818 months = 475×2.6561475 \times 2.6561
  7. Final Price Calculation: Calculating the price after 1818 months gives us:\newlinePrice after 1818 months 1261.65\approx 1261.65 (rounded to two decimal places)